[13a-C302-1~9] 4.1 Plasmonics

▲ [13a-C302-3] Aluminum Plasmonic Full-color Meta-Hologram

〇(D)MU KU CHEN¹, Wei-Yi Tsai¹, Yi-Hao Chen¹, Yao-Wei Huang¹, Wei Ting Chen¹, Pin Chieh Wu^1,2, Chih-Ming Wang³, Greg Sun⁴, Din Ping Tsai^1,2 (1.National Taiwan Univ., 2.Academia Sinica, 3.National Dong Hwa Univ., 4.Univ. of Massachusetts Boston)

Keywords:metamaterials, Hologram, Plasmonics

We report a phase-modulated Full-color meta-hologram (FCMH) that is polarization-dependent and capable of producing images in three primary colors. The FCMH structure is made of aluminum nanorods that are arranged in a two-dimensional array of pixels with surface plasmon resonances in red, green, and blue. The aluminum nanorod array is patterned on a 30 nm thick SiO2 spacer layer sputtered on top of a 130 nm thick aluminum mirror. With proper design of the structure, we obtain resonances of narrow bandwidths to allow for implementation of the multicolor scheme. Taking into account of the wavelength dependence of the diffraction angle, we can project images to specific locations with predetermined size and order. With tuning of aluminum nanorod size, we demonstrate that the image color can be continuously varied across the visible spectrum.